This report reviews international evidence on the effect of capital gains tax rises on government revenues, finding that tax rises tend to decrease revenues while tax cuts tend to increase them. It suggests that aligning CGT rates with income tax, as the UK government has proposed, would significantly hit revenues and worsen the deficit, as well as discouraging much needed investment. It also refutes the idea that CGT is primarily a tax on the rich, suggesting instead that CGT hikes will hit ordinary families and – in particular – retirees. Finally, the report describes the idea that people can easily shift income to capital gains and thus avoid taxes as a theory in search of some evidence, pointing to numerous countries with high income taxes and low capital gains taxes where this does not seem to be problem.